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    • 8. 发明专利
    • DE3706833A1
    • 1987-09-10
    • DE3706833
    • 1987-03-03
    • CANON KK
    • BAN MIKICHIKAKUCHI OSAMUYAMAMOTO HIRONORIOHTSUKA MASARUSHIBA OSAMUHARA KAZUHIKO
    • G01J3/26
    • Fabri-Pérot spectroscopy method comprises a step of directing a light beam at a first refraction angle to a first Fabri-Pérot interference plate and a step of directing a light beam transmitted through the first Fabri-Pérot interference plate to a second Fabri-Pérot interference plate at a second refraction angle, and Fabri-Pérot spectroscopy apparatus comprises Fabri-Pérot interference plates, a control device for changing a spacing between the Fabri-Pérot interference plates, a first optical device for directing a light beam to the first Fabri-Pérot interference plate at a first refraction angle, a second optical device for directing the light beam transmitted through the Fabri-Pérot interference plate at a second refraction angle different from the first refraction angle to the second Fabri-Pérot interference plate, and a seal for externally sealing the Fabri-Pérot interference plates. Gas for protecting the Fabri-Pérot interference plates is filled in the sealed space.